CVE-2018-19434 in webERP
Summary
by MITRE
An issue was discovered on the "Bank Account Matching - Receipts" screen of the General Ledger component in webERP 4.15. BankMatching.php has Blind SQL injection via the AmtClear_ parameter.
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Analysis
by VulDB Data Team • 04/14/2020
The vulnerability identified as CVE-2018-19434 represents a critical blind sql injection flaw within the webERP 4.15 financial management system, specifically affecting the General Ledger component's Bank Account Matching - Receipts screen. This issue arises from insufficient input validation and sanitization mechanisms within the BankMatching.php script, which processes user-supplied data without proper escaping or parameterization. The vulnerability manifests through the AmtClear_ parameter, which is directly incorporated into database queries without adequate security controls, creating an exploitable entry point for malicious actors seeking to manipulate the underlying database system.
The technical implementation of this blind sql injection vulnerability stems from the application's failure to properly sanitize user input before executing database operations. When users interact with the Bank Matching screen and provide values through the AmtClear_ parameter, the webERP application directly incorporates these values into sql queries without proper input validation or parameter binding. This design flaw allows attackers to inject malicious sql code that can be executed within the database context, potentially enabling unauthorized data access, modification, or deletion. The blind nature of this injection means that attackers cannot directly observe query results through the application interface, requiring them to infer information through indirect means such as response timing or error messages, making detection more challenging but not impossible.
The operational impact of this vulnerability extends beyond simple data compromise, as it represents a significant threat to the integrity and confidentiality of financial data within the webERP system. An attacker exploiting this vulnerability could potentially access sensitive financial records, manipulate transaction data, or even escalate privileges within the database environment. The General Ledger component is fundamental to financial operations, making this vulnerability particularly dangerous as it could affect accounting records, payment processing, and overall financial reporting accuracy. The vulnerability's presence in the receipts matching functionality suggests that attackers could specifically target the reconciliation processes, potentially leading to financial fraud or audit trail manipulation that could go undetected for extended periods.
Mitigation strategies for CVE-2018-19434 should focus on implementing proper input validation and parameterized queries throughout the webERP application. The most effective immediate solution involves updating the BankMatching.php script to utilize prepared statements or parameterized queries for all database interactions, ensuring that user input is properly escaped and treated as data rather than executable code. Additionally, implementing comprehensive input validation routines that filter and sanitize all user-supplied parameters, including the AmtClear_ parameter, will prevent malicious input from being processed. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious sql injection patterns, while ensuring that database access privileges are properly restricted to minimize potential damage from successful exploitation attempts. This vulnerability aligns with CWE-89, which specifically addresses sql injection flaws, and represents a common attack vector that falls under the ATT&CK technique of command and control through database manipulation.